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principally (adv.)

mid-14c., "mostly, mainly; most importantly," from principal (adj.) + -ly (2). Late 14c. as "first of all." Meaning "for the most part" attested by 1832.

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Definitions of principally from WordNet

principally (adv.)
for the most part;
Synonyms: chiefly / primarily / mainly / in the main
From wordnet.princeton.edu